My Gulpfile.js

Gulpfile.js

// LOAD PLUGINS
var gulp       = require('gulp');
var minifyCss  = require('gulp-minify-css');
var jshint     = require('gulp-jshint');
var uglify     = require('gulp-uglify');
var concat     = require('gulp-concat');
var cache      = require('gulp-cache');
var imagemin   = require('gulp-imagemin');
var rename     = require('gulp-rename');
var notify     = require('gulp-notify');
var livereload = require('gulp-livereload');

// PATHS
var paths = {
  styles: 	'../_dev/css/*.css',
  scripts: 	'../_dev/js/**/*.js',
  images: 	'../_dev/images/**/*'
};

// STYLES
gulp.task('styles', function() {
  return gulp.src(paths.styles)
    .pipe(minifyCss())
    .pipe(rename({ suffix: '.min' }))
    .pipe(gulp.dest('../_/css'))
    .pipe(notify('A tarefa STYLES está completa!'));
});

// SCRIPTS
gulp.task('scripts', function() {
  return gulp.src(paths.scripts)
    .pipe(jshint())
    .pipe(jshint.reporter('default'))
    .pipe(rename({ suffix: '.min' }))
    .pipe(concat('main.js'))
    .pipe(gulp.dest('../_/js'))
    .pipe(uglify())
    .pipe(gulp.dest('../_/js'))
    .pipe(notify('A tarefa SCRIPTS está completa!'));
});

// IMAGES
gulp.task('images', function() {
  return gulp.src(paths.images)
    .pipe(cache(imagemin({ optimizationLevel: 7, progressive: true, interlaced: true })))
    .pipe(gulp.dest('../_/images'))
    .pipe(notify('A tarefa IMAGES está completa!'));
});

// RERUN THE TASK WHEN A FILE CHANGES
gulp.task('watch', function() {
  gulp.watch(paths.styles, ['styles']);
  gulp.watch(paths.scripts, ['scripts']);
  gulp.watch(paths.images, ['images']);
  livereload.listen();
  gulp.watch(['../_/**']).on('change', livereload.changed);
});

// DEFAULT TASK
gulp.task('default', ['watch']);